She is also engaged to Trump's son Donald Trump Jr.

Announcing the nomination, Trump wrote on Truth Social: "Today, I am very pleased to announce the appointment of Kimberly Guilfoyle as the United States Ambassador to Greece. For many years, Kimberly has been a close friend and ally."

"Her extensive experience and leadership in law, media, and politics along with her sharp intellect make her supremely qualified to represent the United States, and safeguard its interests abroad," he said.

Trump said he feels she is best suited to foster strong bilateral relations with Greece.

In another major appointment, Trump named longtime friend Tom Barrack as US ambassador to Turkey.

"I am pleased to announce that Tom Barrack will serve as our next Ambassador to Turkey. For three decades, Tom successfully managed a global private equity firm. He is a well respected and experienced voice of reason to a wide range of thought leaders in both political and business circles," Trump wrote on Truth Social.